store owners know the thieves as the rainbow girls. >> reporter: yeah, the police don't want to formally name them, but like i say, store owners, security guard, they have told us they refer to the girls as the rainbow girls. they swarm into a store, five, seven, eight at a time, and some distract the shopkeepers while the others stuff as much merchandise as they can into their bag. people come from all over the world to shop the high end boutiques of union square. and police say a group of local girls is frequenting the area. a gang of shoplifters known as the rainbow girls: she has seen them in action. >> come in pacts and then start distracting the workers and then once they get the opportunity, they'll like, you know, stash. >> reporter: last month, we showed you this video of a group of girls arrested following a mass shoplifting at the union square store.